The boss of a truck driver caught with 268,000 rounds of ammunition in Ciudad Juarez, Mexico, said Thursday that his employee took a wrong turn on his way to deliver what he insists was legal cargo bound for an Arizona dealer.

Dennis Mekenye, operations manager at Demco freight company in the Dallas suburb of Arlington, said Jabin Bogan, 27, made “a very honest mistake” when he took a wrong turn that eventually led him to Mexico on Tuesday.

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The federal prosecutor’s office in northern Chihuahua state said Bogan is being held pending investigation on illegal weapons charges. Spokesman Angel Torres said the driver claimed he had no goods to declare. Torres said a gamma-ray inspection of the truck’s cargo compartment revealed the presence of metal canisters holding the ammunition. He says the bullets were hidden under pallets in the truck’s floor.

I guess the driver must have thought the border checkpoint was just some kind of fancy tollbooth. And he wasn’t trying to hide the ammo, he was just making more efficient use of the available storage space.